like a good response to offer our house, whatever they needed after the marathon.>>jim, asyou can imagine, the details still emerging, a lot of people are are coming to grips with what happened. as i said, acceptance is the theme here as people try to make sense. people are really, really hurting, coming together and comforting each other. >> tony, from a security stand tell us more about what you're seeing there around you, you have a police zone, what are the police doing? has the security lessened over the day that you have been there? >> reporter: well, yeah, this morning they had about 12 blocks blocked off. we saw k-9s brought in, so we could assume they were trying to find other things around the building. i have to say we had over a thousand national guardsmen brought in from other states. we have multiple police, fbi, atfs, a lot of jurisdictions trying to assist, the fbi trying to figure out what is going on. a lot of street closures as you have mentioned. i have to tell you, we have police walking through the streets. there is a very big law enforcement presence here. >

're also reviewing travelers, asking them for any photos or video of the crime scene. joining me nowisjimwalsha terrorism expert at mit. he cams to us from watertown massachusetts. jim, welcome in "the war room." >> thank you, happy to be here. >> michael: i want to ask you what are those investors looking for when they comb through the crime scene in a meticulous way. >> by the way, i was out 30 minutes ago and there were a few droplets of rain i'm sorry to say because that might complicate things if we get rain tonight. you're looking for a number of things. you're looking for residue from the explosived itself, it's chemical composition and deduce what kind of a design it was and point you in the right direction. it might an partial fingerprint. it might be the person who was carrying this device ends up leaveing a shred of clothing or cloth from what they were wearing on the backpack itself or dna evidence. there are a number of things that could in principle remain on the device or residue the shrapnel on other parts of it that blew up. >> michael: you're looking at live shots wher

'sjimacostajust recently spoke to vice president joe biden. let's briefly check in withhim.jim, whatdid the vice president say? >> we caught up with vice president joe biden as he was heading into an event to honor former congressional staffer gabe zimmerman, the staffer gunned down in the shooting that also wounded former congressman gabrielle giffords in tucson. that event is going on now. the vice president is speaking right now. as he was heading into that event, we threw a quick question at mr. biden about the events up in boston, what, if anything, he knows about the investigation. and he acknowledged that the government at this point doesn't have any hard information as he called it in this case. here is what he had to say. >> mr. vice president, any comment on what is happening in boston right now? >> we're going to get to the bottom of this. we don't have any hard information yet, but i can assure you we will find out who did it and bring them to justice. >> no sense as to whether this is domestic or foreign-based. >> not yet. >> and you can hear there as the vice president

. and we got a hundred dollars in points from sears to useonjim's mower...hold the phone! ...and points from the grill helped pay for my dress... now you're just pulling my leg. get this, sometimes points just show up in our account. get out of town! with points from shop your way there are more ways to save than ever at sears. oh and this bracelet... i used points to get it for free. yeah, right. and i'm married to lorenzo lamas. hola. this is how to save. this is sears. a 12-year-old fr >>> good morning everyone. it's 7:56. your headlines on this tuesday morning statement-year-old boy is among those recovering from injuries from the explosions in boston. he was hit in the leg. he is due for more surgery. he was at the marathon finish line cheering on his mother who was in the race. >>> -year-old girl is dead, the victim of a fire in san jose overnight. it began around 11:30 last night. investigators say the fire was at a converted living location. it's a small unit the back of a standard home. her 4-year-old sister is now being treated for injuries as well. >